Seasonal dynamics of soil respiration and gross nitrification rate of different subalpine forests in western Sichuan

Shun, 刘顺 Liu; Hongguo, 杨洪国 Yang; Da, 罗达 Luo; Zuomin, 史作民 Shi; Qianli, 刘千里 Liu; Li, 张利 Zhang

doi:10.5846/stxb201712122237

Cited by 1 publication

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“…However, the result that the statistically significant peak occurred in middle to late summer was similar to previous studies, which could reflect seasonal dynamics of soil water and nutrient availability, and an ontogenetic response to local conditions [6,7,71]. There were relatively high temperature and moisture levels in the middle of the growing season, and thus high contents of soil N mineralization [81] and availability [67]. Our data showed contrasting seasonal responses for soil ammonium and nitrate, while the trend for soil nitrate was more consistent with that of fine root biomass during the growing season, the significant peak in fine root biomass lagged behind that of soil nitrate (Figures 2 and 4).…”

Section: Discussionsupporting

confidence: 87%

Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau

Liu

Luo

Yang

et al. 2018

Forests

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Fine roots play a crucial role in plant survival potential and biogeochemical cycles of forest ecosystems. Subalpine areas of the Eastern Qinghai-Tibetan Plateau have experienced different forest re-establishment methods after clear-cutting primary forest. However, little is known about fine root dynamics of these forests originating from artificial, natural and their combined processes. Here, we determined fine root traits (biomass, production and turnover rate) of three subalpine forest types, i.e., Picea asperata Mast. plantation forest (artificial planting, PF), natural secondary forest (natural without assisted regeneration, NF) and P. asperata broadleaved mixed forest (natural regeneration after artificial planting, MF) composed of planted P. asperata and naturally regenerated native broadleaved species. At the soil depth of 0–30 cm, fine root biomass was the highest in PF and fine root production was the highest in NF, and both were the lowest in MF. Fine root dynamics of the three forest types tended to decrease with soil depth, with larger variations in PF. Fine root biomass and production were the highest in PF in 0–10 cm soil layer but were not significantly different among forest types in the lower soil layers. There were positive correlations between these parameters and aboveground biomass across forest types in soil layer of 0–10 cm, but not in the lower soil layers. Fine root turnover rate was generally higher in mixed forests than in monocultures at all soil depths. In conclusion, the natural regeneration procedure after clear-cutting in the subalpine region of western Sichuan seems to be superior from the perspective of fine root dynamics.

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